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Radio-over-fiber linearization with optimized genetic algorithm CPWL model
This study introduces an optimized digital predistorter (DPD) for radio-over-fiber LTE mobile fronthaul. The genetic algorithm-optimized CPWL model significantly improves link linearity, outperforming standard methods.
Area of Science:
- Electrical Engineering
- Optical Communications
- Signal Processing
Background:
- Radio-over-fiber (RoF) systems are crucial for mobile fronthaul, but linearity issues in intensity modulation/direct detection (IM/DD) links degrade performance.
- Existing digital predistorter (DPD) techniques, like the classical memory polynomial DPD, have limitations in addressing these linearity impairments.
- Canonical piece-wise-linear (CPWL) models offer a potential solution but require optimization for maximum effectiveness.
Purpose of the Study:
- To propose and evaluate an optimized CPWL digital predistorter (GA-CPWL) for enhancing the linearity of RoF LTE mobile fronthaul systems.
- To compare the performance of the proposed GA-CPWL predistorter against the standard CPWL model and the classical memory polynomial DPD.
- To demonstrate the effectiveness of the GA-CPWL predistorter under various optical transmission conditions.
Main Methods:
- Development of a novel threshold allocation optimization process using a genetic algorithm (GA) to create the GA-CPWL model.
- Experimental setup of an intensity modulation/direct detection (IM/DD) RoF link to test the DPD techniques.
- Comparative performance analysis of GA-CPWL, CPWL, and memory polynomial DPD under different optical transmission scenarios.
Main Results:
- The CPWL model demonstrated superior performance compared to the classical memory polynomial DPD in the IM/DD RoF link.
- The GA-CPWL predistorter consistently outperformed the standard CPWL model across various tested optical transmission conditions.
- Optimal threshold allocation within the GA-CPWL model was shown to yield highly promising results for linearity enhancement.
Conclusions:
- The proposed GA-CPWL digital predistorter offers a significant advancement in improving the linearity of RoF LTE mobile fronthaul.
- Genetic algorithm-based optimization provides an effective method for enhancing CPWL model performance in optical communication links.
- The GA-CPWL approach presents a promising solution for achieving higher performance and reliability in future mobile fronthaul networks.
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